.bot{
  position: fixed;
  right: 50px;
  bottom: 50px;
  width: 50px;
  height: 50px;
  cursor: pointer;
  background: #fff;
  border-radius: 50%;
  box-shadow: 1px 3px 5px 0px #e0e0e0;
  img{
    width: 100%;
  }
}